Device for improved cleaning and analysis of engine cooling systems



May 20, 1958 c. H. RASCH ETAL 2,335,234

DEVICE FOR IMPROVED CLEANING AND ANALYSIS OF ENGINE COOLING SYSTEMSFiled May 6, 1955 2 Sheets-Sheet 1 INVENTORS C14 L RAsc/land ALTR SW /N@uuo,

ATTORNE Y8.

May 20, 1958 c. H. RASCH EI'AL 2,335,234

DEVICE FOR IMPROVED CLEANING AND ANALYSIS OF ENGINE COOLING SYSTEMSFiled May 6, 1955 2 Sheets-Sheet 2 IN V EN TORS jf: CARL /7. R145 C H8/70 M41. TEE SW4 //v ATTORNEYS.

Unite rates Patent DEVICE FOR IMPROVED CLEANING AND ANALYSIS OF ENGINECBOLING SYSTEMS Carl H. Rasc'h, North Tonawanda, and Walter Swain,Colden, N. Y.

Application May 6, 1955, SerialNo. 506,614

12 Claims. (Cl. 12341.42)

The present invention generally relates to devices and methods used torecondition and analyze the cooling .systems provided in internalcombustion engines, or the like, particularly those used for motivatingautomobiles and other transportation means.

An object of the present invention is to provide animproved device ofsimple compact construction having means integrated therewith to permiteasy detachable connection of the device to engine cooling systems andvarious pressurized air and water supply arrangements to establishcontrolled fluid channeling means therebetween for reconditioning suchsystems.

A further object of the present invention is to provide an improveddevice as aforesaid having transparent means fitted in predeterminedpositional relation to its surrounding elements so as to permit visualmonitoring of the coolant fluid channelled through the device .todetermine the condition of the cooling system and for locating variousdefects so as to determine the type of repair required to eliminatelosses in efliciency in cooling of the engine, all without disconnectionor rearrangement after the initial set up, as more particularlydescribed hereinafter.

A still further object of the invention is to provide an improved methodof servicing engine cooling systems without removal of the thermostaticby-pass valve means usually provided therein, the method includingadmittance of a controlled quantity of pressurized water and air intothe cooling system at predetermined points of entry therein in relationto the thermostatic by-pass valve means for controlling the coolantfluid temperature and thereby the action of such valve means toselectively channel the path of fluid flow in the system whileintermittently agitating the fluid at various temperatures by injectingthe pressurized air into various parts of the system as determined bythe position of said by-pass valve means.

A still further object of this invention is to provide an improved castor molded device embodying a combination of fluid fiow control elementssealed for example in a plastic composition casing for holding theseelements in correctly alined, leak-proof condition under even roughhandling conditions for use accordingto the method of the invention.

A still further object object is to provide a device of the aforesaidtype which is especially adapted for use in carrying out the method ofthe invention and which is simple to manufacture by mass productionmethods and will result insubstantial savings in materials and labor.

Still further objects and advantages of the present invention will beapparent in view of the specification set forth hereinafter.

In the drawings:

Fig. l is a top plan view showing the preferred form of the device ofthe present invention;

Fig. 2 is a front elevational view of the-device illustrated in Fig. 1;

Fig. '3 isa sectional elevational view .takenalongthe zline III--IH ofFig.1;

Fig. 4 is a sectional elevational view taken along the line IV-IV ofFig. 1;

Fig. 5 is a side elevational view schematically showing, partly insection, a common form of engine together with a reduced plan view ofthe device of Fig. 1 connected thereto;

Fig. 6 is a top plan view schematically showing the arrangement of Fig.5 with the device of Fig. l embodied therein being shown in oneoperative condition thereof;

Fig. 7 is a reduced top plan view schematically showing the device ofFig. l in another operative condition thereof;

Fig. 8 is a view similar to the arrangement of Fig. 6 schematicallyshowing the device of Fig. 1 embodied therein in another operativecondition thereof;

Fig. 9 is .a view similar to Fig. 7 with the device thereof in stillanother operative condition.

Referring now more particularly to the embodiment of the inventionillustrated in the drawings, a tubulartransparent member 1 5 ofpredetermined diameter is shown to be fitted at its opposite ends influid-tight relation into spaced T members 14 arid 16. These T members14--16 areeach preferably fitted onto the inner end of a pair ofthreaded nipples 18 and 20 having their respective outer end portions 22and 24 circumferentially undulated for the purpose of providing aconvenient detachable leakproof connection for a pair of flexible hosemembers .26 and 28, as most clearly shown in Figs. 1 and 2.

The central portion of the T member 14 (Fig. l) is formed into anextended portion 34 provided with an aperture 36 extending therethroughand beingfitted at its outer end onto a threaded nipple member 38. Theouter end portion of the nipple 38 is formed into an undulated portion40 for the purpose of providing a detachable leak-tight connection witha hose member :42 through which will be supplied a suitable source ofsuperatmospheric air pressure for the purposes outlined hereinafter inactual operation of the device of the invention (Figs. 1, 2 and 3).

The central portion of the T member 16 (Fig. .1) "is formed with anextended portion 46 connected by means .of a nipple member 48 to a fluidshut-off valve 50 (Figs.

land 4-) which connects to another nipple member 52 provided at itsouter end portion with a suitable hose coupling 54 for detachableconnection to a hose 56 through which may be supplied water at normalfaucet pressure.

For the purpose of .controliing the circulation of the coolant andflushing fluid bypassed through the flexible ,conduitsZti andZS from theengine cooling system, a fluid circulation control valve 58 (Figs. 1 and3) will befitted centrally ofthe 'i' member 14 with its valve stemportion 6t) preferably laterally related to the tubular portion 34. Inaddition, a suitable spring-pressed push-button type air check valve 62(Figs. 1 and 3) will be fitted in the portion 34 ofthe T member 14 forthe purpose of selectively controlling the supply ofpressurized airthrough thepassage .36 during operation of the device of thepresentinvention. This passage 36 will communicate through a passage 64.(Figs. 1 and 3) and around the valve seated (Fig.3) -in the body of thecirculation control valve 58 fitted into the .theabove arrangement thepassage 34 will be placed into communication with the engine coolingsystem through :both the hose connections 26 and 28 with thevalve 58inopen position for permitting the operations described l below.

Thus, it 'isa particuiar featureof the present invention .thatthe.elementstsettforth abovemay be arranged in such Patented May 20,1958 a manner as to be adapted to be permanently set by casting ormolding in a suitable plastic composition body 70, or the like,preferably as shown in Figs. 1, 2, 3 and 4. This member 70 will beprovided with a recess 72 (Figs. 1 and 2) for exposing a portion of thetransparent'tube for the purpose of providing a transparent meansthrough which the condition and rate of flow of the fluid in the enginecooling system may be observed by an operator of the present device.

The member 70 may be made in any suitable form preferably provided witha planar bottom surface, as most clearly shown in Figs. 3 and 4, ontowhich may be affixed a hard rubber pad 74 having its bottom faceserrated for the purpose of providing a supporting surface which willpermit the present device as embodied within the body 70 to be placedupon a planar work surface where it will resist movement thereon due tothe high coeflicient of friction of the rubber and the serrated facethereof during operation of this particular form of the invention.

A further feature is that in actual use according to the method of theinvention, the hoses 26 and 28 may usually be simply connected to theengine 80 (Figs. 5, 6 and 8) by fitting the hose 26 onto the heaterwater return connection (not shown) generally provided in the enginewater pump, and the hose 28 onto the heater inlet connection 82. Forsimplicity the hose 26 is schematically shown to be connected by meansof a T connection 84 to a radiator fluid return hose connection 86(Figs. 5, 6 and 8).

Thus, by virtue of the arrangement as embodied within the casing member70, the selective admittance of water and air under pressure intovarious parts of the engine 80 will be easily controlled as moreparticularly set forth hereinafter simply by adjustment of the valves50, 58 and 62 without requiring any change in the existing arrangementof parts after the initial set up, and therefore resulting inconsiderable saving of the time required to recondition and test anengine cooling system.

A water inlet connection 88 near the top of the radiator 90 willcommunicate through a flexible hose 91 with a thermostatic valve housing92 fitted onto the top of the engine 80 in a manner well known in theart (Figs. 5, 6 and 8). At the bottom of the radiator 90 there isprovided a radiator outlet connection 94 for establishing communication,through the hose 86 with the water pump 98 provided at the forward endportion of the engine for forced circulation of the coolant and flushingfluid through the engine cooling system.

As shown in Fig. 5, a thermostatic valve 102 is fitted within theaforesaid housing 92 so that when the heat transfer fluid in the enginewater jacket 103 is heated to a certain predetermined temperature thisvalve will open to permit passage of this fluid through the radiator inthe usual manner. The water pump drive shaft is integrally connected toa fan belt pulley 104 and a fan 106 with the fan belt being customarilydriven by a pulley 108 mounted on. a shaft 110 that is powered by meansof any suitable gear connection to the engine crankshaft.

In operation as schematically indicated in Fig. 6, a cooling systemflushing operation will be accomplished by first opening the circulationcontrol valve 58 to permit bypassing of the heat transfer fluid in theengine through the hoses 26 and 28, and then admitting a controlledquantity of water under pressure into the engine cooling system throughthe valve 50 so as to maintain the temperature of the coolant fluid highenough to keep the thermostatic valve 102 open, the excess fluid duringthis flushing operaion overflowing out of the radiator in the usualmanner. The admittance of this above controlled quantity of water underpressure through the water valve 50 when in its slightly open positionof adjustment will cause entry of water into the water jacket 103 (Fig.5) wherein it will follow various flow patterns and eventually will passupwardly through the hose 91 into the radiator 90 and out. The systemwill simultaneously be purged with the pressurized air source bydepressing the push-button of the air check valve 62 for the purpose offurther agitating the coolant fluid flowing through the cooling systemto loosen and break up any encrustments formed on the walls thereof andany sediment, or the like, which may have settled therein.

Another feature of the present invention is that changes in theadjustment of the water shut-off valve 50 will vary the temperature ofthe coolant fluid in the cooling system of the engine to permit airpurging thereof with variations in temperature by simple mechanicalcontrol procedures. This has proved to more effectively clean thecooling system by placing more foreign matter in suspension with thecoolant fluid for flushing out during the reconditioning operation.

After flushing in the above manner, the system will be easily reversepurged by simply closing the circulation control valve 58 as shown inFig. 7 whereupon the flow of water through the flexible conduit 26 willbe cut off sothat by further opening of the valve 50 the enginetemperature may be reduced sufliciently to close the thermostaticby-pass valve 102. In this condition a purge of the system bypressurized air will automatically be effected in the direction of thehose 26 and up through the radiator to further aid the cleaning process,the application of the air being employed for a sufficient duration toblow some water out of the radiator through the opening 112 and the hose114 connected thereto so as to lower the level of the fluid in theradiator to permit addition of a predetermined quantity of a specialalkaline solution, after which the circulating valve 58 will be openedagain for the purpose of permitting circulation of this solution forabout 20 minutes at a temperature of about F. under the influence of thepressure developed by the water pump 98, or until the change in thecolor of the solution indicates that the proper amount of chemicalactivity has occurred. This special alkaline solution may include aninhibited sodium or potassium hydroxide compound with an indicator andsurface wetting agent. The indicator will be a chemical agent which willreact with the alkaline components in the solution to measure the degreeof chemical activity of the latter with any foreign matter in thecooling system by the color change in the solution so that as it passesthrough the tube 10 it will be visually inspected during thereconditioning operations to gauge the effectiveness thereof and forreasons set forth with more particularity hereinafter.

After circulating the special alkaline solution in the above manner, thesystem will be flushed out with clear water in substantially the samemanner as described above for the initial flushing stage. However, inthis latter instance additional reversals of the direction of flow ofthe water may be required so that substantially all traces of thespecial alkaline solution will be removed from the cooling systemperparatory to continuance of the operation.

At this point some water will again be blown out of the cooling systemto make room for the addition of a special acid solution through theradiator filler opening 112 and with the valve 58 open and valve 50closed (Fig. 9) the fluid in the system will again be circulated forabout twenty minutes at a temperature of about 170 F. or until thechange in color of the mixture indicates again that the proper amount ofchemical activity has occurred. The acid solution may include aninhibited hydrochloric or muriatic acid concentrate with a chemicalactivity indicator and a surface active wetting agent. Then, the systemwill again be flushed with water to remove all traces of the acidsolution, at which stage the cooling passages should be substantiallyfree of all foreign matter with a resulting increase in the efficiencyof engine operation.

Upon completion of the aforesaid process and before any change is madein the mechanical arrangement, clear Water will again be circulatedthrough the cooling system and the device 70 with its circulating valve58 in open position (Fig. 9) for the purpose of permitting visualmonitoring of this water as it flows through the transparent tube 1d.One large oval bubble filled with smoke formed in the water and passingintermittently through the tube 10 will indicate what is commonly termeda blow-by condition in the engine; that is, a burned head gasket orother condition permitting a leak between the combustion and head valvechambers whereby combustion gases escape into the cooling system.

On the other hand, a chain of small interconnected oval bubbles flowingthrough the tube 10 will indicate a .creeping head condition; that is, ahead not sealed onto the engine block due to the retaining bolts havinglost their required torque either as a result of engine vibration orwarping of the head. However, a chain of small round bubbles flowingthrough the tube 10 will indicate air leaks in the cooling system, inwhich event repairs may be made by the various chemical agents availablefor sealing such leaks. Then, after tightening the head bolts andeffecting a chemical seal where air leaks are indicated, further visualobservation will indicate whether the trouble has been corrected, and ifnot, the need for more drastic measures will be apparent.

Furthermore, it will be appreciated that a properly functioningthermostat will cause the circulation through the transparent tube litto be slow when the coolant is cold and at full flow when it becomes hotfor the reason that progressively higher temperatures cause thethermostatic valve to become more fully open and thus progressivelyincrease the quantity of coolant fluid in circulation as is well'known.Thus, if the rate of flow of the circulation of the water through thetube It) is observed not to follow this above pattern, it will indicatea poor or faulty thermostat which should be replaced. In the event of aworn water pump, the observer will note that the circulation of thecoolant through the tube 10 will be good when the water is cold and willbe slow or will stop when the water is hot. A loose fan belt will beindicated in the event that circulation of water through the transparenttubular member 19 appears to be uneven as by passing therethrough inspurts event after the engine has become warmed up.

Thus, it is believed to be apparent that a still further feature ofdevices made in accordance with the present invention is that relativelyinexperienced garage personnel during the cooling system reconditioningoperations may be able to locate and easily repair may defects which maybe in such systems as a result of mechanical defects in the engine, orelse, to advise the engine owner as to specific repairs that may beneeded to place the engine in good running order and thereby saving theowner what might otherwise be a costly repair.

It will be appreciated that another feature of the pres ent invention isthat after the initial connections as in the manner noted above nofurther connections therewith need to be made during the cooling systemflushing, cleaning, and analyzing procedures. Thus, there will resultconsiderable savings in time and labor during reconditioning andtrouble-shooting operations and for locating any possible defects isengine cooling systems which might cause a loss in efiiciency, or aninoperative condition.

Therefore, while I have particularly described one form of the presentinvention, it will be appreciated by those skilled in the art that theinvention is not so limited but that various modifications and changesmay be made therein within the scope of the present invention and thefol- .lowing claims.

.a supply of water under pressure, said device being arranged fordetachable connection to the: outer ends of a pair of hose membersleading thereto from communication at their opposite ends at spacedpoints with the interior of said engine cooling system, a passagewayprovided through said device to establish communication between theseouter ends of said hose members, first means at one end of said devicecommunicating with said passageway therein for selective supply of saidwater under pressure therethrough, second means at the other end of saiddevice also communicating with said passageway therein for selectivelysupplying said air under pressure therethrough, valve means interposedin said passageway at the juncture thereof with said second means forcontrolling the flow of fluid through the passageway, and a transparentwall portion being provided in the passageway so as to be integraltherewith and being arranged to be visible from one side of said devicefor permitting visual inspection of the condition of the fluid flowingthrough said passageway after circulation through the engine coolingsystem.

2. A unitary coupling device for use in flushing and analyzing enginecooling systems, in combination with an engine cooling system, a supplyof pressurized air, and a supply of water under pressure, said devicehaving a first fluid passage therethrough, said first passage includ inga transparent window portion substantially centrally thereof which isarranged to be visible from one side of said device to permit visualinspection of any fluid pass ing through said passage, a second fluidpassage within said device extending from one end of said first passageand out through a side of the device, a third passage within said deviceextending from the opposite end of said first passage and out through aside of the device, the respective outlets of said passages beingprovided with detachable hose connection means, a pair of hose membersbeing connected at the opposite ends of said first passage and extendingaway therefrom for connection to the engine cooling system to establishcommunication therewith, said supply of pressurized water beingconnected to the outlet of said second fluid passage, said supply ofsuperatrnospheric air being connected to the outlet of said thirdpassage, an air check valve being embodied in said coupling device thirdpassage, a water shut-oi? valve being embodied in said coupling devicein said second fluid passage, and a circulation control valve beingembodied in said coupling device at the juncture of said first and thirdpassages, said control valve having air by-pass means to permit passageof pressurized air through one of said hose members even when saidcirculation control valve is closed, whereby cleaning, flushing andcooling system analysis will be accomplished without rearrangement ofthe connections prior to completion of the entire operation.

3. A device for use in cleaning and analyzing engine cooling systemscomprising, in combination, an engine I cooling system, a supply ofpressurized air, a supply of Water under pressure, fluid conduit meansprovided with a transparent central portion being fitted at one endthereof to a fluid circulation control valve having an upstanding stemportion, the opposite end of said fluid conduit means being fitted to aT member, a pair of spaced substantially parallel tubular portions beingprovided to extend from said circulation control valve and said Tmember, respectively, both being in communication with the interiors oftheir respective body portions and in substantially lateral relation tothe stem portion of the former, said supply of pressurized aircommunicating with thetubular portion fitted into said control valve,said supply of Water under pressure communicating with the other tubularportion, a spring-pressed air check valve for selectively permittingcontrolled charges of pressurized air into the engine cooling systemthrough the interior passageways of said circulation control valve whichwill be arranged to permit passage of air in both directions throughsaid control valve when in open position and in only one direction whensaid control valve is in closed position, a water shut-ofi valve forselectively permitting flow of pressurized water into the engine coolingsystem, and a casing member, the aforesaid elements being arranged insubstantially coplanar relation so that said casing will permanentlyembody the other elements, said casing having a recess in its upper faceto expose said transparent central portion of said fluid conduit meansto permit visual examination of the condition of the fluid passingtherethrough during an engine cooling system cleaning and analyzingoperation.

4. A unitary coupling device in combination with an engine coolingsystem, said device having a body member provided with transparent fluidconduit means therein having a medial portion thereof exposed to view atone side of said body member, the opposite ends of said conduit meanshaving detachable connection means for communication thereof with saidengine cooling system, superatmospheric air supply means provided forcommunication through an air passage interiorly of said body memberwhich communicates with one end of said conduit means therein forselectively applying charges of air into the cooling system, a fluidcirculation control valve being provided in said body member at thejuncture of said air passage and transparent fluid conduit means forcontrolling the flow of fluid and pressurized air thereat, pressurizedwater supply means being provided for communication through a waterpassage in said body member which communicates with the opposite end ofsaid transparent fluid conduit means therein for selectively supplyingflushing water into said engine cooling system.

5. A composite engine flushing device, in combination with a source offluid under pressure, a source of air under pressure, and an enginehaving a coolant fluid circulation system, said device includingdetachable connection means at its periphery for communication with theinterior of said engine cooling fluid circulation system and forselectively channeling said pressurized fluid and air therethrough forcirculation in various flow patterns incidental to cleaning and analysisthereof, and transparent connection means embodied within said deviceand being visible from exteriorly thereof for permitting visualobservation of the rate of flow and the condition of the cooling systemfluid channeled through said device.

6. A unitary coupling device, in combination with an engine coolingsystem, a supply of water under pressure, a supply of air underpressure, said device including spaced hose connection portions arrangedfor detachable connection of the respective ends of a pair of hosemembers, each of said hose members leading thereto from connection atspaced points of said engine cooling system for communication with theinterior thereof, a fluid passage being provided through said devicebetween said spaced hose connection portions, first means incommunication with one end of said fluid passage for selectivelysupplying said water under pressure therethrough, second means incommunication with the other end of said fluid passage for selectivelysupplying said air under pressure therethrough, valve means interposedin said fluid passage at the juncture thereof with said second means forcontrolling the flow of fluid, and a transparent wall portion in saidfluid passage, said Wall portion being arranged to be visible from oneside of said device for permitting visual inspection of the conditionand rate of flow of the fluid in said fluid passage.

7. A composite engine cooling system coupling and test device, incombination with a coolant circulatory system of an engine, apressurized air source, and a pressurized water source, said deviceincluding a fluid passage therethrough having a transparent Wall portionintermediate the ends thereof to permit visual inspection of thecondition of any fluid passing beneath the inside face thereof, firstdetachable connection means at opposite ends of said fluid passage forestablishing communication With said coolant circulatory system of saidengine,

, with a coolant circulatory system of an engine, said device comprisinga body member having a fluid passage therethrough, a wall portion ofsaid body member intermediate the ends of said fluid passage forming apart thereof and being transparent, detachable connection means at theopposite ends of said fluid passage being in communication with saidcoolant circulatory system of said engine, superatmospheric air supplymeans provided for communication through an air passage interiorly ofsaid body member which communicates with one side of said fluid passagetherein for selectively applying charges of air therein, a fluidcirculation control valve being provided in said body member at thejuncture of said air passage and said fluid passage for controlling theflow of fluid and pressurized air thereat, pressurized water supplymeans being provided for communication through a water passage in saidbody member which communicates with the opposite side of said fluidpassage for selectively supplying flushing water into said circulatorysystem of said engine.

9. A composite engine cooling system coupling and test device incombination with a source of air and fluid under pressure, and an enginehaving a fluid cooling system, said device including detachableconnection means at its periphery for communication with the interior ofsaid engine cooling system and for selectively channeling fluid and airtherethrough for circulation in various flow patterns incidental tocleaning and analysis thereof, a fluid passageway being provided tochannel said air and fluid under pressure between said connections, saidpassageway having a transparent wall portion visible from exteriorly ofsaid device for permitting visual observation of the rate of flow andthe condition of the cooling system fluid in the engine, and means, forselectively controlling the flow of said air and water through saidpassageway, whereby all flushing and testing operations in cleaning anengine cooling system may be performed without requiring any changes orrearrangement of said device after the initial set up.

10. An improved method of reconditioning the cooling system of aninternal combustion engine having a radiator to which the flow ofcoolant fluid is controlled by a thermostatic valve, the methodincluding regulating the temperature of the coolant fluid by admitting acontrolled supply of water at one side of the thermostatic valve, thenperiodically injecting charges of pressurized air into parts of thecooling system at opposite sides of the valve with variations in thecoolant fluid temperature for purging this coolant to loosen and breakup any encrustments and sediment which may have formed in various partsof the system, then automatically directing the flow of pressurized aircharges through the radiator as a result of admitting sufiicient waterto lower the coolant temperature to a point where the thermostatic valvewill close, then adding chemical solutions to the coolant fluid andcirculating the mixture through the system for cleaning thereof, and

' then flushing the system with water and purging in the above manner tocomplete the cleaning operation.

11. An improved method of reconditioning an internal combustion enginecooling system placed in communication with a radiator to which the flowof engine coolant fluid is regulated by a thermostatic valve, the methodincluding detachably connecting an external source of both water andpressurized air for selective communication with the engine coolingsystem at opposite sides of the thermostatic valve, respectively; thesesources, together with the engine coolant fluid being selectivelychanneled through a transparent fluid passage for permitting visualinspection of the condition of the fluid passing therethrough; thenadmitting a controlled quantity of the water source to flush the coolingsystem and thereby varying the temperature of the coolant fluid therein,then periodically injecting charges of pressurized air with thevariations in temperature to purge the system for mechanically looseningany encrustments or sediment formed therein, then admitting suflicientwater to lower the temperature for closing the thermostatic valve andautomatically causing a reverse purge of the system by further injectionof pressurized air and then also blowing out 'fluid through the top ofthe radiator as a resutl thereof,

then shutting ofi said sources and adding to the radiator an inhibitedalkaline solution containing a chemical activity indicator and a surfaceactive wetting agent and circulating the resulting mixture throughoutthecooling system, then flushing, purging, and again blowing out fluidfrom the radiator, then again shutting off the external Water and airsources and adding an inhibited acid solution containing a chemicalactivity indicator and a surface active wetting agent into the radiatorand circulating the resulting mixture through the cooling system, thenagain flushing and purging in the above manner, and monitoring theoperations by observing the condition of the fluid by-passed throughsaid fluid passage to determine the progress at various stages of thereconditioning process.

12. An improved method of reconditioning an internal combustion enginecooling system having a radiator, a water pump, a radiator outlet hoseconnection from the bottom of the radiator to said pump, a fluid inletradiator hose connection at the top of the radiator leading to theengine, a thermostatic valve located in said fluid-inlet radiator hosefor controlling the flow of coolant fluid 10 therethrough, and a pair ofwater heater hose connections, the method including establishingcommunicaton between said water heater hose connections through atransparent fluid passage for permitting visual inspection of thecoolant fluid by-passed therethrough for gaging the condition of thesystem, then selectively admitting external sources of water andpressurized air in either or both directions through said flushing hose,the supply of water being controlled to vary the temperature of thefluid in the engine while the pressurized air will be injected with suchtemperature variations to purge the system for mechanically looseningand breaking up any foreign matter therein, then admitting suflicientwater to lower the coolant fluid temperature to a point where thethermostatic valve will automatically shut oil the supply of water tothe radiator, then reverse purging the system by injecting charges ofair into the flushing hose in the direction of the radiator and therebyalso blowing coolant fluid and any'foreign matter in suspension thereinout of the radiator, and then adding chemical solutions into the coolingsystem and repeating the above operations for flushing thereof tocomplete the cleaning operation.

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